Twisted mass fermions: neutral pion masses from disconnected contributions

Details Twisted mass fermions: neutral pion masses from disconnected contributions Twisted mass fermions: neutral pion masses from disconnected contributions

2005-09-13

arxiv.org/abs/hep-lat/0509036v1

PoSLAT2005:033,2006

Physics

High Energy Physics

High Energy Physics - Lattice

6 pages, poster (hadron spectrum and quark masses) at Lattice 2005,Dublin, July 25-30

Scientific paper

Twisted mass fermions allow light quarks to be explored but with the consequence that there are mass splittings, such as between the neutral and charged pion. Using a direct calculation of the connected neutral pion correlator and stochastic methods to evaluate the disconnected correlations, we determine the neutral pion mass. We explore the dependence on lattice spacing and quark mass in quenched QCD. For dynamical QCD, we determine the sign of the splitting which is linked, via chiral PT, to the nature of the phase transition at small quark mass.

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